Lec 16 Interfaces

class Shape(ABC):
    @abstractmethod
    def get_area(self) -> float:
        pass
    def get_permiter(self) -> float:
        pass

shape = Shape()
#errors, because this class is abstract

class Rectangle(Shape):
    def __init__(self, ln, wd):
        pass
    def get_area(self) -> float:
        return ln * wd
    def get_perimiter(self):
        ret 2*ln + 2*wd
rect = Rectangle(2, 4) # works

• in interfaces, subclasses must implement EVERY method